2nd'ary air pump fixed - why the warning light?

[fbloke]

Hello,

I've just had the secondary air pump replaced on my MK1 Leon Cupra 20VT. All seemed well, then the warning light came on a week later. Diagnostics showed same air pump problem although the air pump is fine. The garage did some resets (or something) and the warning light went out. Three days later it's back on again. Taking it to the garage for another look this Friday.

Has anyone else had this problem? Did you manage to resolve it?

Thanks,

Mike.

 

[adam cupra 20vt]

If its the incorrect flow light? I'd say you have a split in the pipe.

Its usually the seal inbetween the 2 halfs of the pump but if you've already fixed this theres not much else it could be.

 

[fbloke]

Thanks Adam, I'll pass this information to the garage and ask them to check.

 

[techie]

It can be operated in final control diagnostics to check they relay etc.

 

[DPJ]

It can be operated in final control diagnostics to check they relay etc.

Can that be done with vag-com, Ross?

 

[Damoegan]

Can that be done with vag-com, Ross?

Subscribed

 

[techie]

Yes it can.

01 - Engine
03 - Final control

and go through the list, it wil pulse the relay to operate the system. The relay and fuse are on the top right of the engine bay as you look at it under a plastic cover.

 

[Damoegan]

Can it be disabled, Ross?

 

[DPJ]

Handy to know.

 

[techie]

Can it be disabled, Ross?

Not sure 100%

 

[Damoegan]

Would be very handy if you could

 

[adam cupra 20vt]

Be good if it could as its bloody annoying first thing in the mornings.

 

[DPJ]

It could be written out of the map, but I think the condition that causes the eml for we that have removed the SAI is ecu / lamda related..........

 

[Damoegan]

I'm thinking more in the way of stopping the EML light for us that have removed it..

 

[fbloke]

Chaps,

Your posts are really helpful, thanks, even if I don't really understand them. I have one question:

Can I still drive the car in this condition without causing it harm? My understanding is that the secondary air pump is concerned with reducing emissions so it doesn't sound too serious.

I just need to get around for one more day before I can get it to the garage. I've had three diagnostics in three weeks that all show the same air pump reading, no other faults. The car runs beautifully and makes no weird sounds.


Thanks,

Mike.

 

[csd_19]

Air pump only runs first thing when the engine is cold to help get the cat up to temp and reduce the amount of unburnt hydrocarbons going down the exhaust.

It gives an "improper airflow" code when the pump is removed since the ecu is expecting the pump to be running, yet the lambda probe is giving a too rich signal level.

Bit strange to be getting the code after having the pump replaced, makes me wonder if they've put the hose back on correctly?

 

[DPJ]

Air pump only runs first thing when the engine is cold to help get the cat up to temp and reduce the amount of unburnt hydrocarbons going down the exhaust.

Ecu also runs it at other times to mix air with fuel vapour vented from the tank.

 

[techie]

Ecu also runs it at other times to mix air with fuel vapour vented from the tank.

Thats done by the N80 valve direct into the inlet manifold though, nothing to do with the SAI is it?

 

[DPJ]

Thats done by the N80 valve direct into the inlet manifold though, nothing to do with the SAI is it?

I think the SAI runs when the N80 opens - to avoid a rich condition at the lamda.

 

[csd_19]

I think the SAI runs when the N80 opens - to avoid a rich condition at the lamda.

I can never hear mine ticking over the racket from the single mass flywheel... lol